Posted by Rick Kropf on November 24, 2000 at 13:56:30:

In Reply to: straight stub bevels posted by Kevin D on October 26, 2000 at 12:56:00:

Definition of terms:

Np - Number of teeth, pinion

Ng - Number of teeth, gear

PitAp - Pitch angle, pinion

PitAg - Pitch angle. gear

FAp - Face angle, pinion

FAg - Face angle, gear

RAp - Root angle, pinion

RAg - Root angle, gear

ODp - Outside dia., pinion

ODg - Outside dia., gear

DPn - Diametral pitch, numerator (2.5)

DPd - Diametral pitch, denominator (3)

Add - Addendum

Ded - Dedendum

DedA - Dedendum Angle

OCD - Outer cone distance

Formulas:

Add = 1/DPd

Ded = 1.157/DPd

PitAp = ATAN(Np/Ng)

PitAg = 90°- PitAp

OCD = Np/DPn/2/SIN(PitAp)

DedA = ATAN(Ded/OCD)

FAp = PitAp + DedA

FAg = PitAg + DedA

RAp = PitAp - DedA

RAg = PitAg - DedA

ODp = Np/DPn + 2 x Add x COS(PitAp)

ODg = Ng/DPn + 2 x Add x COS(PitAg)